Speaker
Description
The 42Ti(p,g)43V reaction rate plays an important role in the nucleosynthesis in type I X-ray bursts. In this work, the 42Ti(p,g)43V rate at temperatures relevant for X-ray bursts has been assessed. The spins, parities, and excitation energies of low-lying 43V levels were calculated with the OXBASH code, and were used, along with a new mass measurement of 43V, to obtain an updated thermonuclear reaction rate for 42Ti(p,g)43V. The rate uncertainties were determined from the uncertainties in the 43V resonance parameters. Our new reaction rate differs from the most widely utilized rate by a factor of five at temperatures up to 3 GK, with reduced uncertainty by a factor of two compared to previous assessments. The final abundances calculated using the new rate differ by more than a factor of two for a number of critical isotopes including 44Ti, 56Ni, 60Zn, and 76Sr isotopes. Details of our approach and implications on X-ray burst nucleosynthesis will be presented.
Keywords: rp-process, nucleosynthesis, proton capture, precise mass, mass uncertainty.
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